Re: [uml-devel] Re: [RFC] PATCH 0/4 - Time virtualization

[Jeff Dike]

On Thu, Apr 13, 2006 at 05:31:27PM -0700, john stultz wrote:
> Looks interesting. I've never quite understood the need for different
> time domains, it only allows you to run one domain with the incorrect
> time, but I'm sure there is some use case that is desired.

There are a few possible answers -

If when this virtualization stuff is done, no one has done anything with
time, someone is going to moan.

Once in a while, you want to fiddle your system clock to make sure that
a cron job or something does what it's supposed to.

There was some extra infrastructure that UML needed in order to start using
this stuff, so I chose a fairly simple virtualization case to accompany it.

> I'm not psyched about possible namespace vs nanosecond confusion w/
> terms like "time_ns", but that's pretty minor.

Yeah, names can be changed.

> Also I hope you're not wanting to deal w/ NTP adjustments between
> domains that have the incorrect time? That would be very ugly.

No, the domain stores an offset from the system time, so it automatically
gets the system's NTP adjustments.

				Jeff
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